subject
Mathematics, 14.03.2020 01:27 bullockarwen

A large clinical trial was designed to determine whether a certain vitamin improves the general health of adults. The investigators first identified 85 variables that measure various aspects of the general health of adults. Because each adult in the clinical trial was to serve as his or her own control, the 85 variables were measured for each adult, both before taking the vitamin and after taking the vitamin for three months. The investigators then performed 85 matched-pair t-tests, one for each variable. They found statistically significant results at the 0.05 level in 2 of the variables, both in the direction of improved general health. Which of the following should the investigators conclude?

(A) There is evidence that the vitamin improves the health of adults because 2 of the 85 tests were statistically significant.
(B) There is evidence that the vitamin improves the health of adults because in clinical trials investigators typically underestimate the proportion of the population that is helped by a vitamin.
(C) There is insufficient evidence that the vitamin improves the health of adults because at the 0.05 significance level, one could easily get statistically significant results in 2 out of 85 tests just due to chance variability.
(D) There is insufficient evidence that the vitamin improves the health of adults because the sample size of 85 is not large enough to draw a conclusion.
(E) No conclusion can be drawn because an even number of variables is needed for a matched-pairs design.

ansver
Answers: 1

Other questions on the subject: Mathematics

image
Mathematics, 21.06.2019 15:00, TheOneandOnly003
Naomi’s parents want to have 50,000, saved for her college education, if they invest 20000 today and earn 7% interest compound annually, about how long will it take them to save 50 thousand
Answers: 3
image
Mathematics, 21.06.2019 15:30, priceisright11401
Using the quadratic formula find the zeros of the given polynomial -5x^2+3x-11
Answers: 3
image
Mathematics, 21.06.2019 15:50, tmarie03
Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares
Answers: 1
image
Mathematics, 21.06.2019 17:00, angeleyes42
When only separate discreet points are graphed it is called?
Answers: 1
You know the right answer?
A large clinical trial was designed to determine whether a certain vitamin improves the general heal...

Questions in other subjects: